Rodless pump



W. N. HUFF Dec. 7, 1937.

RODLESS PUMP Filed Sept. 24, 1936 llll' nection with the drawing,

Patented 7A, 1937 uNrl'iI-:ol STATES' 4PAr1=zirrf ori-ica vnomnss rUMP Walter N. Huil', lva'rwootl,` Tex.

Appueenen september 24,1936. serial Ne. 102.423

invention relates to pumps, especiallyair confined in an `air-tight space within the well or both and use the energy of.I expansion thus 'stored in the spring in the air or in both to force the fluid above lthe surface. j Other objects VWil appear as the .description proceeds.

.The invention will be lclearly understood from the following detailed description,-taken in c on' in which: Figure 1 isa cross-section on a vertical diametrical plane. r

Figure 2 is a' cross-section looking in the direction of the arrows, on line 2-2 of Figure 1. 'Figure 3 is a cross-section looking inthe direction of the arrows on line`3-3 of Figure 1.

The well tubing I reaches from the surface to a short distance. above the bottom of the well.

A cylinder 2, herein called the suction cylinder,

is connected to said tubing by an annular collar l.

The lowerend of this suction cylinder 2 is closed by means of an apertured plate v4.

A check valve 5 opening aperture in the plate 4.

A removable device/ 6, designated Ain its entirety as a pumping device, is supported in the tubing on pins or projections 1, 1, secured to the walls ofthe tubing I. 1

-This device B comprises a cylinder l of greater diameter than the suction cylinder 2 having a attached thereto by meansl of which the pumping device l may be lifted as a whole out of the y tubing I.

Within the cylinder 8 is a piston II having a stem I2 extending upwardly therefrom. A metal washer .I3 is connected to the upper end of said stem or rests thereon. fined between saidwasher I3 and the closure Supporting pins I5 or f secured on the walls 8 and when the coil spring vMis extended the ports IS.

As the piston'. cylinder 8 above the piston is conilned in that space and will be compressed on an upward movement ofthe spring.

washer I3 rests upon the suppresv inwardly controls the end anda'hook -Ill valve 5 into the suction the suction cylinder 2 without .forcing the uid A coiled spring I4 is con'- l projections are n is air-tight the air in the.

5. Claims.V .i (Cl. 10S-44) lAttached to the under side of the piston II -is a rod IB extending into the suction cylinder 2. To the lower -end of rod I6 an apertured piston I1 is secured. A check valve opening upwardly and properly confined controls said aperture.

The well tubing. I is closed at the top by an apertured cap IQ; NInthe aperture of. this cap a pipe 20 is suitably secured and leads to a valve L casing 2l in 'which a three-way valve 22 operates.`

`From this casingy lead vtwo pipes, 23 communieating with the `atmosphere and emptyinginto a tank for receiving oil from the well and 24 communicating ,With a pump or a reservoir under pressure and thus forming the source of. pressure for operating the pumping device. The arrangements for "supplying the pressure to thewell tubing and storing thedelivered iluid may be of any preferred description but are preferably such as is shown in my co-'pending application, Serial No. 81,110, flied May 31, 1936.

The above description andthe drawing illustrating the sam are not to be considered as limiting applican s device to the precise structureshown `and described but rather as exemplary only.

In the operation-of the device, valve 22 is turned to admit pressure into the. well tubing I, /valve I8 closes fand the space above the same is thus closed except for the inlet of. the pressure so iiuid. Cylinders while merely resting on supports 1 will remain in that position. Piston jII receiving pressure on its lower face and being of greater area than piston I1 will rise, compressing the air above it and the spring' I4. Piston I1` moving upward will force liquid from the upper portion of suction cylinder 2 into the well 'tubing and at the same time by its tendency to create a vacuum will draw fluid past check cylinder 2.

0n the release of pressure the coiled spring and the compressed air will force down pistons II and I1, valve I8 will open, valve l will close and .therefore piston I1 merely moves down in in either direction. Piston II, however, in its 1 downward movement forces the uid in the well tubing uparound the exterior of. cylinder 8 and, the outlet for' the fluid having been opened in releasing the pressure, the fluid passes out through the delivery pipe. The cycle is then repeated.

Having thus fully v,I claim is:

1. In` an apparatus described my invention what for use'in raising oil from 4whereby-the pumping device as a whole may be removed from said well tubing.

2. The device as claimed in claim 1, wherein the pumping device comprises a pumping cylinder having a closedupper end and of greater cross-sectional area than that of the suction cylinder, an air-tight piston slidable inY said pumping cylinder, an air-tight Apiston slidable in said suction cylinder and having an upwardly opening check valve therein, and a rod rigidly 'connecting said pistons and means for alternately applying and releasing pressure to the interior of said welll tubing whereby on the application of pressure said pistons will rise and fluid above the suction cylinder piston will be lifted into the.

well tubing and the air in the pumping cylinder will be compressed and on release of pressure the compressed air will move said pistons down and lift to a higher level the fluid in the well tubing. 3. 'I'he device as claimed in claim 1, wherein the pumping device comprises a pumping cylin- -der having .a closed upper end and of greater ,cross-sectional area. than that of the suction cylinder, an air-tight pi'ston .slidable in said pumping cylinder,.a stem extending from theuppe'r face of said piston and a rigid washer on the 4upper portion of said stem, a coil spring bearing on said washer vand on said closed upper end of said pumping cylinder, an air-tight piston slidable in said suction cylinder and having an upwardly lopening check valve therein, and a rod -rigidly connecting said pistons and means Kfor alternatelyh applying .and releasing pressure to the interior of said well tubing whereby on the application of pressure, said pistons will rise and iluid above thesuction cylinder piston will be lifted into the well tubing and the air in the pumping cylinder and the coil spring will be compressed and on release of pressure the compressed air and spring will move said pistons down and lift to 4a. higher .level the iluid'in the Well tubing.

4. In an apparatus for use in raising oil from a well, a well tubing, a suction cylinder of smaller diameter thanaid well tubing, means forming a fluid tight connectionbetween the upper end of said suction cylinder' and the lower end vof said. Well tubing, means for supporting said pumping device in said well tubing, said pumping device comprising a pumping cylinder, having a closed upper end and of greater cross-sectional areathan that of the suction cylinder, an airtight piston slidable in said pumping cylinder, astem extending vfrom the upper face of said piston and a rigid washer on the upper portion of said stem, a coil spring bearing on said washer and on said -closed upper end of said pumping cylinder, anair-tight pistonA slidable in saidv suction cylinder and having an upwardly opening check valve therein, and a. rod rigidly connecting said pistons and means foralternately applying A release of pressure the compressed spring will movesaid pistons down and lift to a higher level t the fluid in the well tubing.

,5. The device as claimed in claim 4 in which an apertured plate closes the lower end of the suction cylinder and there is an upwardly opening` checkvalve controlling the aperture.

WALTER N. HUFF. 

